"Avira" is completely useless as well as fraudulent, because it claimed to have found "security issues" on a brand new Mac containing little more than one minimally configured User Account. How a brand new Mac could possibly have "security issues" is an unresolved question, but after letting it perform a "full system scan" for about three hours it never identified those "issues".
"Kaspersky" is equally useless for the reasons you already determined, as well as having claimed to be compatible with the "latest release of OS X", which at the time it identified as one at least a year out of date. How well do you suppose a product will be able to respond to a real threat that could arise at any time, when its developer doesn't even know what version of OS X is the most recent?
The point is that one of those things convey any benefit, and it is irresponsible to delegate operating system security to software. At best they will do nothing, and at worst will prevent your Mac from working while exposing you to greater malware intrusion and information theft than if you had left it to work as Apple designed. It's your Mac though, so do as you please. If that means burdening it with junk, knock yourself out. Judging from the volume of problems reported on this site directly attributable to ill-conceived "anti-virus" junk, it seems to be a very popular pastime.
Maybe I'm the fool for trusting Gartner and Barclays on this one...
That's also up to you to decide.